English schools are introducing some assessment tests for all children. Some people are unhappy with this. A politician was interviewed on the radio about it, and was asked one of the questions. (This is for 10 and 11 year old children).
"I went to the cinema after eating my dinner" - is "after" a preposition or subordinating conjunction?
There is a clip here: http://www.bbc.co.uk/programmes/p03syxdv
Is "after" in the quoted sentence a subordinating conjuction, or a preposition?